Car-brake.



PATENTED R. '20, 19Q.6.

E. G. TILLMAN.

GAR BRAKE. v APPLICATION FILED JUNE 7, 1906 mmi' 4 3] 1 wanton said arepresented by 5. The supporting-wheels 1 UN TE STATES PATENT orrrcn.

GAR-BRAKE.

I Specification of Letters Patent.

Patented March '20, 1906.

Application filed June 7,1905. Eaerial Nb. 264,127.

To all whom it may concern.-

Be it known that I, EDWARD G. TILLMAN, a citizen of. the United States,residing at Thayer, in the county of Fayette and State of'West Virginia,have invented new and useful Im rovements in Car-Brakes, of which thefol owing-is a specification. V f

This invention relates to improvements in sprag-brakes to be used-onmine-cars and for similar purposes. v

Figure 1 isa side elevation-of a mine-car fitted with sprag-brakesembodying my improvements. Fig. 2 is a bottom plan view of the same.Fig. 3 is a bottom plan view of a car,'showing, a modified manner ofoperating the brakes. Fig. 4 is a view of one of the sprags. I

In the drawings, A represents as an entirety amine-carof anywell-knowntype. v 1 and .2 represent axles of the car; 3 3 and 4 4, the sup ortingtrack wheels mounted onthe es. The frame or body of the car is areformed with radially-arranged spokes 6, as indicated in Fig. 1, althoughthey may be formed with solid webs provided at intervals 1 with lugs orprojections, as indicated by 6 in Fig. 3, the purpose of which will behereinafter described. Preferably each car is provided with two spragsor brake-bars 7 and 8 arranged one at either side of and substantiallyparallel with one of the axes of one of the car-axles, the sprags beingarranged. transversely of the car and adapted toreciprocate-longitudinally in straight lines and-in opposite directionsin order to engage with the adjacent supporting-wheels at opposite sidesof the car tostop their rotation.

9 is a swinging bar or plate arranged longitudinally of the car midwaybetween the sides and pivotally supported from the bottom of the car on,a pivot 9, about the axis of which is free to oscillate. The axis ofthis pivot lies, preferably, in thevertical plane of the axis oftheadjacent axle. Oneither side of the pivot 9 the swinging bar 9 isslotted, as indicated at 9 9', these cam slots or rooves preferablybeing curvilinear in shape for a purpose to be hereinafter described.

At their inner ends the sprag-bars 7 and 8 have pivotally connected tothem the slideblockslor antifriction-rollers 7 8 respectively, theformer of which is fitted into and adapted to engage with the walls ofthe slot 9*? and the latter of which is fitted into and adapted to,engage with the walls of the slot 9 10 represents clips or guidessecured to the car-bottom and adapted to guide and support the spragsnear their centers, and 10 10f are guides secured to the car-bottom andadaped to support and guide the outer end of each sprag, the guides 1010 for each sprag serving to hold the sprag at all times in parallelismwith the adjacent axle. v

The front end of the bar 9 is supportedand guided by a guide-bar 11secured to the bottom of the car and arranged to permit the said bar toswing freelyin one direction a predetermined distance in order to setthe sprags and to prevent the swinging of the bar in the oppositedirection when the sprags are in inactive position. v

12 12 are bars or rods arranged longitudinally at either side ofthe-car. .At their rear ends each of these rods is pivotally connectedatv 12 to one of the hand-levers13 13 and arranged at either sideof-thecar and pivotally connected'at 14 to the adjacent side of the car.

13? represents guides .for the upper ends of the hand-levers 13 13. Attheir rear ends each of these longitudinally-arranged bars .1. 2 isconnected to one end of achain 15 chain leads over anantifriction-roller .16, mounted on the side of the car, and thencedownward and around an antifriotionguide- .roller 17, secured to thebottom of the car,

and thence to the front end vof-the swinging bar 9, to which it issecurely fastened.

. To operate the sprags, the operator grasps the handle 13 and throws itrearward-1y,

thereby swinging the bar 9 about its pivotal connection 9 and causing itto impart longitudinal motion to the s rags 7 and 8,, the slides orantifriction-rol ers thereon sliding along the grooves 9 9*,respectively, in the said swinging bar and causing the sprags to moveoutward and engage with the adjacent track-wheels and lock them againsttheir ro-, tation. To release the brakes, the operator grasps thehandelever 13, which ,is thrown forward by therearward throw of thelever This i 13, and throws it rearward, swinging the bar 9 in theopposite direction and causing the sprags to be withdrawn fromengagement with the wheels, the cooperation of the walls of the slots inthe said bar with the slides on the sprags insuring that the sprags willbe i moved longitudinally in paralle 1sm with the car-axle and with aminimum of friction be- 1 tween the slide and the swinging bar.

Inthe modification shown in Fig. 3 a spring 18 is secured at one end tothe bottom of the car (shown at 18) and at its other end to the frontend of the swinging bar 9, the operatingehain being connected to theother side of the said swinging bar, as hereinbefore described. In thisconstruction but one hand-lever is required, as the spring will causethe bar 9 to swing normally into the position in which it holds thesprags out of engagement with the wheels.

It will be noted that I have constructed a sprag-brake comprised of afew parts and having the sprags connected to a swinging bar in such amanner as to impart longitudinal movement to the sprags as the said barswings about its axis, the connection be tween each sprag and bar beinga sliding one.

What I claim is 1. In a car-brake, the combination with the car-frame,an axle mounted in said frame, and the supporting-wheels of the axle, ofthe swinging bar pivotally connected to the bottom of the car and havingcam-slots therein, of sprag-bars arranged transversely of the car andhaving their outer ends adapted to engage with said car-wheels, and theslideblocks secured to the inner ends of said spragbars fitted into saidcam-slots in said swinging bar and adapted to be actuated by the wallsof said slots to effect a longitudinal movement of said sprag-bars,substantially as set forth.

2. In a brake of the class described, the

' combination with the car-frame, the car-axle,

and the wheels thereon, of the swinging bar pivotally mounted on thecar-bottom and aving a slot therein, the sprag-bar arranged transverselyof the car-frame, and the slideblock carried by said sprag and adaptedto be engaged by the walls of said slot to move %the Islpraglongitudinally, substantially as set ort v 3. In a brake of the classdescribed, the combination with a car frame, the axle mounted in theframe and the wheels thereon, of the sprag-bars arranged transversely ofthe car-frame and adapted to have their outer ends engage with the saidwheels, and having slide-blocks carried by their inner ends, and aswinging bar pivotally mounted on the car-bottom and having cam-slotstherein, the slots of which are adapted to engage with the slide-blockson the sprag-bars to move the bars longitudinally, substantially as setforth.

4. In a brake of the class described, the

combination with the car frame, an axle mounted on the frame and thesupportingwheels of the axle, of the swinging bar pivotally connected tothe bottom of the car and having a cam-slot therein, the sprag-barmounted transversely of the car and having its outer end adapted toengage with one of said car-wheels, the guides for said bar adapted tohold it in parallelism with the said axle, and-the slide-block carriedby the inner end of said sprag-bar and fitted into said cam-slot in theswinging bar and adapted to be actuittedh by the walls thereof,substantially as set ort 5. In a car-brake, the combination of thecar-frame, an axle mounted therein and the supporting-wheels of theaxle, of the swinging bar pivotally connected to the bottom of the caron an axis in the vertical plane of the axis of said axle, and havingcam-slots arranged at either side of said pivotal connection, thesprag-bars arranged transversely of the car at either side thereof andon opposite sides of said axle and adapted to have their outer endsengage with the adjacent supporting-wheel, and the slide-blocks securedto the inner ends of said sprag-bars and each fitted into one of saidslots in said swinging bar and adapted to be actuated by the wallsthereof, substantially as set forth.

6. In a car-brake, the combination with a truck-frame, an axle thereforand supportingwheels for the axle, of the sprag-bars arrangedtransversely of the truck -fra1nc, a swinging bar, and cam-likeconnections between said sprag-bars and said swinging bar, each adaptedto reciprocate one of the spragbars in a straight line into and out ofengagement with one of said supporting-wheels, as said swinging bar isoscillated.

7. In a car-brake, the combination with a car-frame, an axle thereon andsupportingwheels on the axle, of the longitudinally-reciprocatablesprag-bars, each adapted to be thrown into and out of engagement withone of said supporting-wheels, a swinging bar, and cam'connectionsbetween said swinging bar and said sprag-bars adapted to impartstraight-line motion to the sprag-bars as the swinging bar isoscillated.

In testimony whereof I afiix my signature in presence of two subscribingwitnesses.

EDWARD G. TILLMAN.

Witnesses:

A. W. HALL, J. L. NAYLOR.

